Process of making brushes.



L. T. MATHER-l PROCESS OF MAKING BRUSHES.

APPLICATION FILED JAN. lib I915.

1,Q59,Q1 Patented Mar. 12, 1918.

WITNESSES: I INVENTOR,

iv/Mm A TTOR NE Y.

LUTHER T. MATHER, 0F SPRINGFIELD, MASSACHUSETTS.

PROCESS OF MAKING BRUSHES.

Specification of Letters Patent.

Application filed. January 18, 1915. Serial No. 2,956.

To all whom it may concern:

Be it known that I, LUTHER T. MATHER, a citizen of the United States ofAmerica, and resident of Springfield, in the county of Hampden and Stateof Massachusetts, have invented certain new and useful Improve ments inProcesses of Making Brushes, of which the following is a full, clear,and exact description.

This invention relates to improvements in ratory brushes such as areextensively used in shoe factories and which are in the nature ofimprovements on patents of Phillips, dated Aug. 7th, 1899, No. 642,484,and Larsson, dated Jan. 8, 1901, No. 665,832.

In these patents the brush has been composed of brush strips produced byapplying and stitching strip tape transversely and in doubled relationto brush stock and in then winding the same helically on a hub thereforand confining theportions of the brush strip adjacent and in engagementwith the hub under pressure, thereon.

'The brushes so made have not been a satisfactory product inasmuch asunder the centrifugal action produced by high rotation of the brushes inuse, the bristles or brush stock, by reason of insuflicient anchoragehave loosened and been thrown out whereby the life of the brush and itseficiency while in use have been entirely inadequate.

i The present invention consists in a process for the making of a brushof the general character set forth in the aforenamed patents, and by'the exercise of which the bristles,

horse hair or other brush stock included will remain securely bound inthe central body or hub of the brush during the wearing life of thebrush, and until entirely reduced and worn away by use without anyliability of loosening and detachment.

The invention is described in conjunction with the accompanying drawingsand is set forth in the claim.

In the drawings:-

Figure 1 is a face view. of a short portion of indefinite length. ofabrush strip such as. that included in the rotary brush of the ldnd towhich this invention relates.

Fig. 2 is a side view of a brush bundle. Figs. 3 and 3 are crosssectional views as taken on line 'w-w, Fig. 1, showing the employment,as may be variously adopted, of sin le and double tapes.

ig. 4 is a plan view showing the brush the brush strip by strip coiledand as being subjected to the immersing and saturating action of theliquid pitch, the employment of which forms part of this process.

Fig. 5 is a sectional view as taken on line 5-5, Fig. 4.

Fig. 6 is a sectional view centrally through the completed brush.

In carrying out this process, I produce the applying and stitching ofstrip tape a in doubled relation and at opposite sides of the bristlesor horse hair, Tampico fiber or whatever brush stock or combination ofbrush stocks may be employed, and more or less in accordance with theprocedure under the aforementioned Phillips and Larsson patents. Thetape strip having a length 'suflicient for the making of one or severalbrushes is then wound to involute curved form to form a bundle A, asrepresented in Figs. 2, 4 and 5, the same being temporarily tied bystring 6.

A pan D or shallow receptacle forms a part of the apparatusappropriately employed and into which is supplied, in suflicientquantity, 2. heavy liquid solution d, which as provided by me iscomposed of what is commercially known as Burgundy pitch and alcohol, inproportions of about 37 pounds ofthe pitch to 3 gallons of the alcohol.v

The tape inclosed or butt end portion of the brush strip bundle is setinto the receptacle as represented in Figs. 4 and 5 and left therein fora short time but sufliciently long for the heavy pitch solution tothoroughly permeate the tape and the portions of the brush stockconnected therewith.

The bundle removed from the receptacle containing the pitch solution andunwound and hung up, subject to the partially drying and hardeningaction of the atmosphere for a considerable tlme, say for two or threedays.

The brush strip of suiiicient length for one 7 head or cap G? is screwedo'r'otherwise se- Patented Mar. 112, 11918.

is then untied cured on the hub confining the wound brush strip securelyin its place,the marginal portions of the head or cap G forming theannular confining flange opposite the permanent flange g.

The pitch saturated and intimately comobtained, and to this end thefollowing action of the pitch upon the fibers and binding tape'isrepeatedly varied by the alteration of the form of the combined strip.The strip is first placed in involute form in pitch, when the inner faceof the stripwillbe slightly compressed and the outer face will beslightly stretched, and the fibers will be rolled on themselves topositions different from that assumed when the strip is extended orwithout short curves.

When the coil is removed and straightened out, the fibers tend to resumetheir natural positions, against unequal strip tension, and the tensionof the walls of the strip becomes equal.

When the partially dried, pitch impregnated, brush strip is wound inhelical form upon the hub and placed under compression, a second changein the tension and relations of the brush fibers and strip walls takesIn other words, the repeated change inthe strip form during themanufacture of the brush develops what may be termed a kneading actionof the strip walls upon the anchored fiber ends, and this kneadingaction tends to increase the degree of penetration of the pitch, uponthe strip and the faces of the fibers.

I claim I The process of brush making consisting in sticking a quantityof brush fibers to a flexible tape to form a flexible brush strip,coiling said brush strip in involuteform, immersing said involute coilin a solution of pitch and alcohol so that the strip and the brush fiberends engaged therewith are impregnated by the pitch, removing theimpregnated coil from the pitch solution and unwinding the coil andallowing it to partially dry, coiling the partially dried strip inhelical form around a hub, and maintaining said helically coiled stripunder compression.

Signed by me at Springfield, Mass, in presence of two subscribingwitnesses.

. L. T. 'MATHER. Witnesses:

G. R. DRISCOLL, WM. S. BELLOWS.

